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Research in Astronomy and Astrophysics 2023年第10期23卷 176-183页

作者： Tao wang p.f.wang J.L.Han Yi Yan Ye-Zhao Yu feifei Kou National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China The key Laboratory for Radio Astronomy and Technology Chinese Academy of SciencesBeijing 100101China Qiannan Normal University for Nationalities Duyun 558000China Xinjiang Astronomical Observatories Chinese Academy of SciencesUrumqi 830011China

previous studies have identified two emission modes in pSR B1859+07: a normal mode that has three prominent components in the average profile, with the trailing one being the brightest, and an anomalous mode(i.e., the A mode) where emissions seem to be shifted to an earlier phase. Within the normal mode, further analysis has revealed the presence of two submodes, i.e., the cW mode and c B mode, where the central component can appear either weak or bright. As for the anomalous mode, a new bright component emerges in the advanced phase while the bright trailing component in the normal mode disappears. New observations of pSR B1859+07 using the fivehundred-meter Aperture Spherical Radio Telescope(fAST) have revealed the existence of a previously unknown emission mode, dubbed the Af mode. In this mode, all emission components seen in the normal and anomalous modes are detected. Notably, the mean polarization profiles of both the A and Af modes exhibit a jump in the orthogonal polarization angle modesin the bright leading component. The polarization angles for the central component in the original normal mode follow two distinct orthogonal polarization modes in the A and Af modes respectively. The polarization angles for the trailing component show almost the same but a small systematic shift in the A and Af modes, roughly following the values for the c W and cB modes. Those polarization features of this newly detected emission mode imply that the anomalous mode A of pSR B1859+07 is not a result of “phase shift”or “swooshes” of normal components, but simply a result of the varying intensities of different profile ***, subpulse drifting has been detected in the leading component of the Af mode.

关键词： (stars:)pulsars:individual(pSR B1859+07) polarization plasmas

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fAST pulsar *** profiles of 682 pulsars

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Research in Astronomy and Astrophysics 2023年第10期23卷 71-175页

作者： p.f.wang J.L.Han J.Xu C.wang Y.Yan W.C.Jing W.Q.Su D.J.Zhou T.wang National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy University of Chinese Academy of SciencesBeijing 100049China

pulsar polarization profiles form a very basic database for understanding the emission processes in a pulsar *** careful polarization calibration of the 19-beam L-band receiver and verification of beamoffset observation results,we obtain polarization profiles of 682 pulsars from observations by the five-hundredmeter Aperture Spherical radio Telescope(fAST)duringthe Galactic plane pulsar Snapshot survey and other normal fAST *** them,polarization profiles of about 460 pulsars are observed for the first *** profiles exhibit diverse *** pulsars have a polarization position angle curve with a good S-shaped swing,some with orthogonal modes;some have components with highly linearly polarized components or strong circularly polarized components;some have a very wide profile,coming from an aligned rotator,and some have an interpulse from a perpendicular rotator;some wide profiles are caused by interstellar *** derive geometric parameters for 190 pulsars from the S-shaped position angle curves or with orthogonal *** find that the linear and circular polarization or the widths of pulse profiles have various frequency *** with a large fraction of linear polarization are more likely to have a large Edot.

关键词： polarization (stars:)pulsars:general astronomical databases:miscellaneous

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The fAST Galactic plane pulsar Snapshot survey:*** design and pulsar discoveries

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Research in Astronomy and Astrophysics 2021年第5期21卷 5-42页

作者： J.L.Han Chen wang p.f.wang Tao wang D.J.Zhou Jing-Hai Sun Yi Yan Wei-Qi Su Wei-Cong Jing Xue Chen X.Y.Gao Li-Gang Hou Jun Xu K.J.Lee Na wang peng Jiang Ren-Xin Xu Jun Yan Heng-Qian Gan Xin Guan Wen-Jun Huang Jin-Chen Jiang Hui Li Yun-peng Men Chun Sun Bo-Jun wang H.G.wang Shuang-Qiang wang Jin-Tao Xie Heng Xu Rui Yao Xiao-peng You D.J.Yu Jian-ping Yuan Rai Yuen Chun-feng Zhang Yan Zhu National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China CAS Key Laboratory of fAST NAOCChinese Academy of SciencesBeijing 100101China School of Astronomy University of Chinese Academy of SciencesBeijing 100049China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China Department of Astronomy Peking UniversityBeijing 100871China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China Department of Astronomy Guangzhou UniversityGuangzhou 510006China School of physical Science and Technology Southwest UniversityChongqing 400715China

Discovery of pulsars is one of the main goals for large radio *** five-hundredmeter Aperture Spherical radio Telescope(fAST),that incorporates an L-band 19-beam receiver with a system temperature of about 20 K,is the most sensitive radio telescope utilized for discovering *** designed the snapshot observation mode for a fAST key science project,the Galactic plane pulsar Snapshot(GppS)survey,in which every four nearby pointings can observe a cover of a sky patch of 0.1575 square degrees through beam-switching of the L-band 19-beam *** integration time for each pointing is 300 seconds so that the GppS observations for a cover can be made in 21 *** goal of the GppS survey is to discover pulsars within the Galactic latitude of±10∘from the Galactic plane,and the highest priority is given to the inner Galaxy within±5∘.Up to now,the GppS survey has discovered 201 pulsars,including currently the faintest pulsars which cannot be detected by other telescopes,pulsars with extremely high dispersion measures(DMs)which challenge the currently widely used models for the Galactic electron density distribution,pulsars coincident with supernova remnants,40 millisecond pulsars,16 binary pulsars,some nulling and mode-changing pulsars and rotating radio transients(RRATs).The follow-up observations for confirmation of new pulsars have polarization-signals recorded for polarization profiles of the ***-detection of previously known pulsars in the survey data also leads to significant improvements in parameters for 64 *** GppS survey discoveries are published and will be updated at http://***/GppS/.

关键词： pulsars:general

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The fAST Galactic plane pulsar Snapshot *** of 76 Galactic Rotating Radio Transients and the Enigma of RRATs

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Research in Astronomy and Astrophysics 2023年第10期23卷 1-70页

作者： D.J.Zhou J.L.Han Jun Xu Chen wang p.f.wang Tao wang Wei-Cong Jing Xue Chen Yi Yan Wei-QiSu Heng-Qian Gan peng Jiang Jing-Hai Sun Hong-Guang wang Na wang Shuang-Qiang wang Ren-Xin Xu Xiao-peng You National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy University of Chinese Academy of SciencesBeijing 100049China Department of Astronomy School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China National Astronomical Data Center Great Bay AreaGuangzhou 510006China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China Department of Astronomy Peking UniversityBeijing 100871China School of physical Science and Technology Southwest UniversityChongqing 400715China

We have carried out the Galactic plane pulsar Snapshot(GppS)survey by using the five-hundred-meter Aperture Spherical radio Telescope(fAST),the most sensitive systematic pulsar survey in the Galactic *** addition to more than 500 pulsars already discovered through normal periodical search,we report here the discovery of 76 new transient radio sources with sporadic strong pulses,detected by using the newly developed module for a sensitive single-pulse *** small DM values suggest that they all are Galactic rotating radio transients(RRATs).They show different properties in the follow-up *** radio pulses have been detected from 26 transient radio sources but no periods can be found due to a limited small number of pulses from all fAST *** followup observations show that 16 transient sources are newly identified as being the prototypes of RRATs with a period already determined from more detected sporadic pulses,and 10 sources are extremely nulling pulsars,and 24 sources are weak pulsars with sparse strong *** the other hand,48 previously known RRATs have been detected by the fAST,either during verification observations for the GppS survey or through targeted observations of applied normal fAST *** for one RRAT with four pulses detected in a session of 5-minute observation and four RRATs with only one pulse detected in a session,sensitive fAST observations reveal that 43 RRATs are just generally weak pulsars with sporadic strong pulses or simply very nulling pulsars,so that the previously known RRATs always have an extreme emission state together with a normal hardly detectable weak emission *** is echoed by the two normal pulsars J1938+2213 and J1946+1449 with occasional brightening *** strong pulses of RRATs are very outstanding in the energy distribution,their polarization angle variations follow the polarization angle curve of the averaged normal pulse profile,suggesting that the predominant s

关键词： (stars:)pulsars:general surveys methods:data analysis

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Electron kinetic effects in back-stimulated Raman scattering bursts driven by broadband laser pulses

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Matter and Radiation at Extremes 2024年第4期9卷 54-67页

作者： Q.K.Liu L.Deng Q.wang X.Zhang f.Q.Meng Y.p.wang Y.Q.Gao H.B.Cai S.p.Zhu Graduate School China Academy of Engineering PhysicsBeijing 100088China Institute of Applied physics and Computational Mathematics Beijing 100094China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Shanghai Institute of Laser plasma Shanghai 201800China HEDpS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China School of physics Zhejiang UniversityHangzhou 310027China

We examine electron kinetic effects in broadband-laser-driven back-stimulated Raman scattering(BSRS)bursts using particle-in-cell *** bursts occur during the nonlinear stage,causing reflectivity spikes and generating large numbers of hot ***-duration simulations are performed to observe burst events,and a simplified model is developed to eliminate the interference of the broadband laser’s random intensity *** the simplified model,we isolate and characterize the spectrum of electron plasma *** spectrum changes from a sideband structure to a turbulence-like structure during the burst.A significant asymmetry in the spectrum is *** asymmetry is amplified and transferred to electron phase space by high-intensity broadband laser pulses,leading to violent vortex-merging and generation of hot *** proportion of hot electrons increases from 6.76%to 14.7%during a single violent burst *** demonstrate that kinetic effects profoundly influence the BSRS evolution driven by broadband lasers.

关键词： scattering kinetic simplified

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Connections Between Induction Generator Effect and Open-loop Modal proximity to Cause Sub-synchronous Oscillations in Series-compensated power System

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CSEE Journal of power and Energy Systems 2024年第3期10卷 963-973页

作者： Wenjuan Du Yang wang H.f.wang Tao Zhao Tim Littler College of Electrical Engineering Sichuan UniversityChengduChina School of Electrical Engineering the Queen’s University of BelfastBelfastUK IEEE

The induction generator effect(IGE)and the openloop modal proximity(OLMp)are two different reasons why subsynchronous oscillations(SSOs)in a series-compensated power system(SCpS)may *** IGE attributes the growing SSOs to negative resistance,while the OLMp explains the SSO mechanism from the standpoint of modal *** this paper,we investigate the connections between the IGE and the OLMp through equivalent RLC circuit and open-loop modal *** investigation is conducted for two types of seriescompensated power systems where either a synchronous generator or a DfIG is connected at the sending *** investigation reveals the conditions,in which the IGE and the OLMp may jointly cause the growing SSOs,i.e.,both the IGE and the OLMp can explain why the growing SSOs ***,the investigation indicates that the IGE and the OLMp may be totally irrelevant and lead to growing SSOs *** implies that it is possible that in a SCpS,the growing SSOs are only due to the IGE,and the OLMp is non-existent,and vice ***,when the growing SSOs occurs in a SCpS,examination based on both the IGE and the OLMp should be carefully conducted in order to find if the oscillatory instability is due to the IGE,or the OLMp,or both of them.

关键词： Induction generator effect open-loop modal proximity series compensation sub-synchronous oscillations

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The fAST Galactic plane pulsar Snapshot survey:Ⅰ. project design and pulsar discoveries

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Research in Astronomy and Astrophysics 2021年第5期21卷 6-43页

作者： J.L.Han Chen wang p.f.wang Tao wang D.J.Zhou Jing-Hai Sun Yi Yan Wei-Qi Su Wei-Cong Jing Xue Chen X.Y.Gao Li-Gang Hou Jun Xu K.J.Lee Na wang peng Jiang Ren-Xin Xu Jun Yan Heng-Qian Gan Xin Guan Wen-Jun Huang Jin-Chen Jiang Hui Li Yun-peng Men Chun Sun Bo-Jun wang H.G.wang Shuang-Qiang wang Jin-Tao Xie Heng Xu Rui Yao Xiao-peng You D.J.Yu Jian-ping Yuan Rai Yuen Chun-feng Zhang Yan Zhu National Astronomical Observatories Chinese Academy of Sciences CAS Key Laboratory of fAST NAOC Chinese Academy of Sciences School of Astronomy University of Chinese Academy of Sciences Kavli Institute for Astronomy and Astrophysics Peking University Xinjiang Astronomical Observatory Chinese Academy of Sciences Key Laboratory of Radio Astronomy Chinese Academy of Sciences Department of Astronomy Peking University Department of Astronomy Guangzhou University School of physical Science and Technology Southwest University

Discovery of pulsars is one of the main goals for large radio *** five-hundred-meter Aperture Spherical radio Telescope (fAST),that incorporates an L-band 19-beam receiver with a system temperature of about 20 K,is the most sensitive radio telescope utilized for discovering *** designed the snapshot observation mode for a fAST key science project,the Galactic plane pulsar Snapshot (GppS) survey,in which every four nearby pointings can observe a cover of a sky patch of 0.1575square degrees through beam-switching of the L-band 19-beam *** integration time for each pointing is 300 seconds so that the GppS observations for a cover can be made in 21 *** goal of the GppS survey is to discover pulsars within the Galactic latitude of ±10° from the Galactic plane,and the highest priority is given to the inner Galaxy within ±5°.Up to now,the GppS survey has discovered 201 pulsars,including currently the faintest pulsars which cannot be detected by other telescopes,pulsars with extremely high dispersion measures (DMs) which challenge the currently widely used models for the Galactic electron density distribution,pulsars coincident with supernova remnants,40 millisecond pulsars,16 binary pulsars,some nulling and mode-changing pulsars and rotating radio transients (RRATs).The follow-up observations for confirmation of new pulsars have polarization-signals recorded for polarization profiles of the ***-detection of previously known pulsars in the survey data also leads to significant improvements in parameters for 64 *** GppS survey discoveries are published and will be updated at http://***/GppS/.

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flame Structure of Methane and Kerosene Combustion with a Compact Concave flame-Holder using the LES-pdf Method

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Journal of Thermal Science 2024年第1期33卷 222-234页

作者： wang fang wang Yunfan WEI Guanyi LIU Denghuan JIN Jie JONES p.William School of Energy and power Engineering Beihang UniversityBeijingBeijing 100191China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK

Compact flame-holders for afterburners are an increasing requirement for modern aero ***,flame-holder design is non-trivial since high inlet temperatures,velocities,and elaborate structures induce complex turbulence,combustion,and spray coupling in modern *** this work,the LES-pdf and stochastic fields-Lagrangian particle spray methods are used to investigate methane and aviation kerosene combustion structures formed by new-type concave *** flow pattern,combustion mode,and flame structure of gaseous and liquid fuel around a concave flame-holder are analyzed,discussed,and compared with experimental *** reveal that the flame stability of a concave flame-holder is better than that of the non-concave ***,when using liquid fuel,the concave flame-holder forms a stable and compact *** results suggest concave flame-holders are a promising design for compact afterburners.

关键词： concave structure flame-holder LES-pdf spray combustion flame structure AECSC

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Biocompatible Biphasic Iontronics Enable Neuron-Like Ionic Signal Transmission

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Research 2024年第3期2024卷 795-796页

作者： Xiaoyi wang Aleksandar p.Ivanov Joshua B.Edel Department of Chemistry Imperial College LondonMolecular Sciences Research HubLondon W12 OBZUK

Biocompatible connections between external artificial devices and living organisms show promise for future neuroprosthetics and *** study in Science by Zhao and colleagues introduces a cascade-heterogated biphasic gel(HBG)iontronic device,which facilitates electronic-to-multi-ionic signal transduction for abiotic–biotic *** by neuron signaling,the HBG device demonstrated its biocompatibility by regulating neural activity in biological tissue,paving the way for wearable and implantable devices,including brain–computer interfaces.

关键词： asi Signal Neuron

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A combined experimental and DEM investigation of grain interlocking in sheared granular assemblies

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particuology 2024年第7期90卷 436-451页

作者： Rui Lu Qiang Luo Tengfei wang David p.Connolly Tao Xie School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Key Laboratory of High-Speed Railway Engineering(Southwest Jiaotong University) Ministry of EducationChengdu 610031China School of Civil Engineering University of LeedsLeeds LS29JTUK Department of Civil Engineering McMaster UniversityHamiltonONCanada

Compacted granular material,integral to geotechnical engineering,undergoes translation,rotation,and interlocking when subject to shear displacements or external *** present study focuses on the interlocking of heterogeneous granular materials,a complex behavior influenced by gradation,compaction,and varying particle geometry,and has consequently received limited attention in existing *** address this research gap,we conducted an analysis on the effect of grain interlocking on the shear resistance of granular assemblies,using a combination of laboratory testing and the discrete element method(DEM).Initially,large-scale direct shear tests were conducted on gravel−sand mixes with varying degrees of compaction and normal *** of the mixes also underwent subsequent shear reversal to explore the differences in grain interlocking between the two shearing processes on the shear *** analyzing the laboratory results,a mesoscopic scale investigation was performed by replicating the test using discrete element *** facilitate this,granular particle geometries were measured using 3D laser scanning based on the physical lab ***,based on these scans,discrete element R-block and ball models were utilized to construct both the coarse and fine particles within the *** vibro-compaction was employed to regulate the degree of *** results indicate that an increase in vertical pressure,coupled with a zero dilatancy angle,results in a rising stress ratio,indicative of grain *** interlocking exhibits a positive correlation with both the coarse content and the degree of compaction,and varies depending on the shear *** interlocking progresses,the shear band,induced by particle movement,expands and is associated with reduced particle rotation near the shear *** study further reveals a consistent positive correlation between interlocking and the principal orientation angle of strong normal c

关键词： Granular material Interlocking Shear resistance Direct shear Discrete element method Vibro-compaction

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